Rear diffuser layout Brawn BGP001


These drawings illustrate the position of the two holes (bottom left drawing - highlighted in bright yellow) in the underbody of the Brawn, in the vertical section where the reference and step planes meet. These boost the efficiency of the rear diffuser, but also need careful gearbox and suspension...
ref[formula1.com]
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Renault & Kubica drop KERS, gearbox penalty for Glock

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Just three cars look set to run KERS in Sunday’s Chinese Grand Prix, after Renault and BMW Sauber’s Robert Kubica decided not to abandon the system for Shanghai.
Ferrari announced before the weekend that they would not be running KERS here following the reliability problems they experienced at the last round in Malaysia. Now Renault have also opted to drop their system after evaluating Friday practice data.
Kubica, who did not race KERS in either Melbourne or Sepang, also used Friday’s sessions to see if it could bring him an advantage at the Shanghai €nternational Circuit. However, with tyre degradation already proving an issue, the Pole found the additional weight only complicated matters and hence will not use it either.
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The Red Bull Vettel

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Sebastian Vettel gave Red Bull Racing its first pole position in qualifying at Shanghai, ahead of the resurgent Fernando Alonso.
Mark Webber added to Red Bull's delight with third on the grid, while the hitherto dominant Brawns were back in fourth and fifth, Rubens Barrichello ahead of Jenson Button.
Vettel opted to make only one run in Q2 and Q3, yet topped both sessions, taking a dry weather pole to follow his pole in the rain at Monza for Toro Rosso last year.
Red Bull looked set to sweep the front row until Alonso split them, proving that Renault's rapidly-introduced updates were already paying off.
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The Chinese Grand Prix Preview - Brawn under pressure?

Jenson Button
Even with Brawn GP’s trick diffuser having been declared legal, championship leader Jenson Button expects to have to fight really hard for his Formula One hat-trick in Shanghai this weekend, as the Chinese Grand Prix moves to the third slot on the calendar for 2009.
“I am understandably delighted with how our season has begun, but we are only two races in and everyone at the team is aware that our competitors will not stand still,” the 29 year-old Englishman says. “We fully expect a tough fight from here if we want to continue our early successes.
Brawn, along with Toyota and Williams, come to Shanghai boosted by news that they can continue to race their disputed rear diffusers, after they were declared legal by the FIA’s International Court of Appeal on Wednesday. It’s a decision that leaves rivals scurrying to add similar designs to their cars as soon as possible - and one that leaves Button eager to get racing again before they have a chance to catch up.
“The Shanghai International Circuit (SIC) is an enjoyable one for the drivers and a good technical challenge to find the right set-up,” he adds. “I particularly enjoy the high-speed sections and the overtaking opportunities going into the tight right-hander at turn five and at the end of the back straight."
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